Attached Link: http://arbaro.sourceforge.net/

If the tree lab still leaves ya hangin' and nobody else has some good ranges to punch into it, there's always arbaro. It can make some poly-heavy meshes, but it does have a nice looking weeping willow and can export to .obj which is useful for rendering in Bryce.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.